“This review highlights the gap between ship capabilities and the missions the Navy will need LCS to execute,” said the report prepared last year for the Navy by Rear Admiral Samuel Perez. “Failure to adequately address LCS requirements and capabilities will result in a large number of ships that are ill-suited to execute” regional commanders’ warfighting needs.

The 36-page report obtained by Bloomberg News is at odds with assurances from Navy leaders that their project is on course to deliver a small, speedy and adaptable ship intended to patrol waters close to shore.

The review, requested by Admiral Jonathan Greenert, the chief of naval operations, echoes findings by critics inside the Pentagon who deride the vessel. The report, stamped “confidential draft,” found that the plans to swap equipment needed for different missions are impractical, the vessel’s width may prevent it from docking in some ports, and the decision to proceed with two versions complicates logistics and maintenance.